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MR imaging of the thyroid: Correlation between apparent diffusion coefficient and thyroid gland scintigraphy

✍ Scribed by Mikio Tezuka; Yuji Murata; Ryuji Ishida; Isamu Ohashi; Yukio Hirata; Hitoshi Shibuya

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
569 KB
Volume
17
Category
Article
ISSN
1053-1807

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✦ Synopsis

Abstract

Purpose

To evaluate the usefulness of echo‐planar MR imaging for assessing the thyroid function and confirm the clinical use of MR imaging for thyroid diseases.

Materials and Methods

Thirty‐four patients with a variety of thyroid disorders (24 Graves disease; five subacute thyroiditis; five Hashimoto thyroiditis) were examined using T1‐, T2‐, and diffusion‐weighted magnetic resonance (MR) imaging and thyroid scintigraphy with Tc‐99m pertechnetate.

Results

The ADC values obtained from the diffusion‐weighted images of the patients with Graves disease were significantly higher than those of patients with subacute hyroiditis and Hashimoto thyroiditis, though no difference among those disorders was observed on T1‐ and T2‐weighted images. Based on the ADC value, anisotropy was not observed in the thyroid gland. An ADC value of 1.82 × 10^−3^ mm^2^/second or higher indicated the presence of Graves disease (sensitivity 75%, specificity 80%).

Conclusion

Diffusion‐weighted MR images may be of value for the diagnosis of thyroid diseases and could be clinically important in the evaluation of thyroid function. J. Magn. Reson. Imaging 2003;17:163–169. © 2003 Wiley‐Liss, Inc.

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